Impinj shares pare gains as Amazon.com says no RFID used at automated store

SAN FRANCISCO (Reuters) - Shares of radio-frequency identification (RFID) chipmaker Impinj Inc pared gains on Monday after Amazon.com Inc said its new checkout-free grocery store, which opened to the public on Monday, does not use the technology.

SAN FRANCISCO (Reuters) - Shares of radio-frequency identification (RFID) chipmaker Impinj Inc pared gains on Monday after Amazon.com Inc said its new checkout-free grocery store, which opened to the public on Monday, does not use the technology.